1. A joint program of the U. S. Departments of Commerce, Defense, and Transportation during the 1980s and 1990s to develop and deploy a network of operational Doppler weather radars. 2. The popular name for the radar itself, the WSR-88D weather radar, which became the operational network radar for the U. S. National Weather Service, U. S. Air Force, and Federal Aviation Administration during the early and middle 1990s. The nominal transmitted wavelength of the WSR-88D is 10. 5 cm (S band) and the nominal circular beamwidth is 0. 95°.